You can update multiple columns in SQL for a single record or multiple rows in the table. Let's look at both: Single row update We use the single-row update when modifying values of multiple columns for one specific record. This method is straightforward when altering the values of a parti...
http://www.ludou.org/update-multiple-rows-with-different-values-and-a-single-sql-query.html
-- update multiple rows satisfying the conditionUPDATECustomersSETcountry ='NP'WHEREage =22; Run Code Here, the SQL command changes the value of thecountrycolumn toNPifageis22. If there is more than one row whereageequals to22, all the matching rows will be modified. Update all Rows We ...
这对于 UPDATE 和 DELETE 触发器很常见,因为这些语句经常影响多行。 而这对于 INSERT 触发器比较少见,因为基本 INSERT 语句仅添加单行。 但是,由于 INSERT 触发器可以通过 INSERT INTO (table_name) SELECT 语句触发,因此插入多行可能导致调用单个触发器。 在下列情况下关于多行的注意事项尤为重要:DML...
ERROR1062(23000): Duplicate entry'1005'forkey'PRIMARY'##所以在使用update时,一般会结合orderby子句对数据先进行排序 mysql>updatestudent2setsid=sid+1orderbysiddesc; ##默认是升序,desc表示降序 Query OK,2rowsaffected (0.06sec)Rowsmatched:2Changed:2Warnings:0##使用limit限定行数,一般和orderby配合使用 ...
3-Inserting Multiple Rows 插入多行 INSERT INTO … VALUES (), (), () 4-Inserting Hierarchical Rows 插入分层行 5-Creating a Copy of a Table 创建表复制 / CREATE TABLE … AS 6-Updating a Single Row 更新单行 / UPDATE … SET … WHERE … ...
情况2: Inserting rows with optional attributes INSERT INTO PRODUCT(P_CODE, P_DESCRIPT) VALUES('BRT-35', 'Titanium drill bit'); *情况3: Inserting multiple rows(利用subqueries) INSERT INTO tablename SELECT columnlist FROMtablename; 2.UPDATE:更新 ...
So far, you have looked at several different ways to retrieve and review your data. In this section, you will learn how to update your data. In the following two sections, you will learn about deleting and inserting rows. When you update, delete, and insert, you change the data -- you...
Example:data = table([1;0],"VariableNames","NewName") Data Types:table Row filter condition, specified as amatlab.io.RowFilterobject or a cell array ofmatlab.io.RowFilterobjects. Filters determine which database rowssqlupdatemust update with which data. If multiple database rows match a filte...
A positioned update using a WHERE CURRENT OF clause updates the single row at the current position of the cursor. This can be more accurate than a searched update that uses a WHERE <search_condition> clause to qualify the rows to be updated. A searched update modifies multiple rows when the...